unfortunately this is highly illegal if you live in US. and grey if you live in canada. welcome to the wonderful word for the dmca.
linky that’s right you can get prison terms greater then that if had raped someone. still since i am in canada i will put this as "personal backup" or "fair-use", and give you a rundown of some steps. do you have a large Hard Drive? image the dvd. nero can do that. or you could rip it into divx or xvid (which just released 1.0). i think the forum rules here prohibit any direct links to theses types of programs, sorry. but google is your friend.